Adding-machine.



A AQ- HUHTUN. ADDiNG MACHINE. APPLICATION FILED SEPT-24.19%.

Patented Oct, 22, 1918.

WITN ESSES.

' ATTORNEYS; I

UNITED srn'rns Parrnr .ALLEN A. HORTON, OF HIGHLAND PARK, MICHIGAN. .ASiGNQR TO BURROUGHS ADDING MACHINE COMPANY, OF DETRQIT, MICHIGAN, UURIF'UBATIDN OF MICHIGAN.

ADDIN G-MAGIHIINE.

" Specification of Letters Patent.

Patented Oct. 22,

Original application filed May .19, 191}, Serial No. 839,563. Divided and this application. filed September It;

i 1915. .Seria1No. 52,338. v

To all whom it may concern Be it known that I, ALLEN A. Hon'roN, a citizen of the United States, residing at Highland Park. in the county of Wayne and 'State' of Michigan, have invented certain new. and useful Improvements in Adding I Machines, of which the following is a specification.

The present invention relates to adding or calculating machines of the type shown in myprior Patent No. 1,016,501, issued February 6, 1912, and the Pasinski Patent No. 1,023,168, issued April 16, 1912, wherein levers are employed to turn forwardly a sethe wheels being such that the wheels are turned forward when the levers are returned to normal. position by their springs after having been depressed by the keys. The! present application is a division of my prior application filed May 19," 1914, Serial No. 839,563,11pon which Patent- No. 1,180,39fi, issued April 25, 1915. a

In the aforesaid Pasinski patent means are disclosed for preventing any overthrow of a higher order registering wheel by reason of its receiving a carrying impulse when a key of its own order is being held down, at which time the overthrow-preventing-pawl, normally effective upon said wheel, is withdrawn. An object of the present invention is to prevent the ossibility of overthrow of the registering w eel under any and all circumstances whether the wheel is receiving a carrying or a primary impulse. ThusI pro vide for checking any tendency of a wheel to advance or forge ahead of its actuator under a primary impulse as well as to check any tendency of a higher order wheel to overrotate under a carrying impulse when a key of its own order out of normal whether fully or only partially depressed. In the machine here illustrated, as in the machine wheel oscillated by the associated lever and a pawl carried by a gear wheel which conmcnt of the pawl as must accompany advance of the numeral wheel, and consequent turning of the pawl-carrying wheel, ahead of the ratchet wheel or independently thereof, whether such ratchet wheel is in motion or dormant. r 1

In "the drawings which accompany and form part of this specification and illustrate a preferred form of embodiment of my invention, Figure 1 illustrates inright side elevation with casing in section and some interior parts. removed, a machine in which myinvention is embodied; Fig. 2 is :a, sectional elevation on an enlarged scale of the parts of my invention at normal; Fig. 3 a similar view showing the overthrow preventing action; Fig. & IS a fragmentarv view of some of the same parts under a ditthe complete machine, though it should be noted that the keys D do ncit operate upon levers having segment gears as in the construction of said prior patents, but thatthe wheel driving segments F are se-iarately mounted upon a frame cross rod J at. the

front part. of the machine and; operatively connected by bars or links 19 and bell cranks 21. with the levers F-respectively (Fig. 1) The levers are pivoted at their rear ends and are upheld by springsF and extend along the respective rows of key stems after I the manner of the levers F of the aforesaid patents, bnt unlike the latter they simply terminate at their forward'ends in plain extremities. At an intermediate point each lever has a depending portion F 3 slotted as at f to embrace a roller stud 21 upon one arm of a bell crank 21, which is here shown as in the form of a triangular frame. Therear arm or branch of the bell crank is piv orally connected to the rear end of a link or bar 19 whose forward end is piv j otallyconnected to the segment- F. Ob- ,viously depression of the lever F rockslthc bell crank, throws the barli) forward and 1 upon the V I Y Y effect:otipositively"arresting the bar and the rocks the segment. The bari's formed with series of lugs 19* supplying vertical shoulaers to abut against the rear'sidesot' lugs d temswhich obviously has the segment. Preferably springs 22 are applied to thebell cranks'21 to serve in conjunctionwitlrthe springs F 2 for restorlng the levers I and driving the registering mechan sm.

Thesegments F -mesh with gearwheels or pin'ions H to which are secured internal ratchets H, and gear wheelsI (Figs. 2, 3,

6) are independently journaled alongside the latter respectively on the same frame rod and are driven by saidra-tchet wheels through theniedium of pawls presently to be identified, said gear wheels meshing with other gear wheels L which carry planet pinions in mesh with internal gears upon the numeral wheels and. with sun gears asin the constructions of said prior patents.

Next referring' in detail to theoverthrow pre'ventingdevices of my present invention, the pawls I which are carried by the gears I" have a. special formation-distinguishing them from the-similarly lettered pawls of any aforesaid prior patent, for the purpose nected registering -wheel tends to overrotate, which involves turning of the gear wheelI independently of the ratchet wheel, the accompanying movement of the pawl will cause its tail-end to. strike against one of the shoulders-?, as illustrated in Fig. 3,

whereby the movement of the wheel is arrested. Th1sobv1ously will occur whether theratchet wheel happens to be dormant at the time'or whetherit is being rotated to :drivethe gear wheel I and numeralwheel. In either case the riding of the end i of -the pawl over the inclined back of'thc ratchet tooth will tilt the pawl-on its pivot and the combined tilting and rotarial movement ofthe pawl will'cause its tail-end to strike against one of'the-shoulders 1Q before the endi can escape past the ratchet tooth. Of course the pawl might be at varying posi tions relative to a shoulder 10 when this combined'tilting and rotarial motion occurs,

: but the extent of the end-edge of the tail of coiiperationwvith overthrow preventing .nieans Thus-each pawl. has-an extension or rail 4: on the side of'the pawl-pivot opposite that where the a'ctingend of the pawl proj'ect's for cooperation with the ratchet wheel,- and this pawl-tail projects past the ratchet wheehfor cooperation with. theinterior] shouldered e'dge'of a'plate or ring 10. .In

order'to provide for this relation of pawl of the pawl is such, and the length of the shoulders 10 is such, that whatever may be the position of the pawl at thetime, some part of the end edge of its tail will strike 10 and block the overthrow. In the case of such action when the ratchet is in motion, the latter will immediately overtake the I pawl and the pawl will disengage from the and ratchet,- gear wheel I? is not 'mounted closelyadjacent the-open side of the ratchet qwheel, asin the prior constructions, but is formed orunited with a spaclng hub I so "thatthebo'dy of the pawl may lie outside the ratchet wheel as clearly shown in Fig. 6, that portion of'the pawl which engages withturned extremity i encirclcsthe'spacebetween said gear wheel the-.ratchet'bhing in the form of a laterally The ring orplate 10 and the ratchet and has acontinuous series .of stopshoulders 10 to provide ,for encounter with the tail of the pawl wherever the latter may happen to 'beas a result of the turning of the gear wheel I. It-is of course essential that the ratchet shall not be interfered with during key depression when thelratchetwheel should. run freely over the pawl. Consequently said shoulders 10? are out at such an angle and so spaced apartand' the intervening shoulders 10 'so cut, as to allow of unobstructed vibration of thepawl resultant from the passing of the ratchet wheel over its acting end 2". Thus as the in- I clined back of a ratchet tooth slides over the pawl-end (Fig. 4) the extremity of the pawl-tail i will swing over one of the shoulders 10, and back again when the R ratchet has passed. However, if the co n Shoulder 10 (under action of its spring 2') against some part of one of the shoulders so that the rotationof the gear wheel I by,

vention is not limited to this particular use but may be employed in'a wide variety of connections.

I claim;

1. In a machine of the class described, the combination of driving and driven elements; an intervening ratchet and pawl con nection; and-a stop member for the pawl to encounter under relative movement between it and the ratchet at any stage of advancing v movement of the driven member. a

2. In a-machine of the class described, the combination of driving and driven elements; an internal ratchet geared to the driving element; a pawl carried by the driven element; and a shouldered stop member into engagement with which the pawl is thrown when advancing independently of the ratchet.

its wheel and. the ratchet wheel.

4.:In a machine of the class described,

the combination of' ratchet and pawl driving and driven wheels, and an encircling 111- mama" encircling smiid and havin a seriesfif internal abutment s'hou ders for the end of the pawl-tail to encounter movement of the driven wheel inadvance of the driving ratchet. I

ALLEN Ai HORTON. Witnesses:

J. A. Bnomnr, H. I. BUHLER. 

